Seeing is knowing. That’s why the KOQOON GQ4 features a panorama viewing window. This special glass-ceramic window combines the best aspects of glass and ceramic. It’s not only extremely durable, strong, and aesthetically pleasing but also complex to produce. This is partly because it’s convex, and partly because it must withstand grill fumes and thermal shocks. Glass-ceramic has uniquely precise properties: nearly no thermal expansion, high chemical resistance, and readiness to perform even under extreme conditions. All this ensures you never lose sight of your valuable grilled goods, even with the lid closed. Less opening means better taste. Incidentally, glass-ceramic is typically used in aerospace, metrology, and astronomy. You’re in good company.